never had the logging of problem so can't help, the username password you are changing is to make xampp safe not the mysql database by default the username is set to 'root'.
The only way to change the root password is shown on the Xampp site under the FAQ's http://www.apachefriends.org/en/faq-xam ... #password0
Try deleting your cookies but next time when you set a username and password for Xampp highlight the HTTP button not the Cookie before pressing submit
3) Dubbleclick on my index.php ind my www/flygenrings folder.
But it does not run the php code as expected.
i'm a newbie like you so take this with a pinch of salt..i don't thing you can run php code by double clicking, you have to run it in your web browser
try typing 'localhost/flygenrings/' in the address bar...example if you what to run test1.php in your flygenrings folder type localhost/flygenrings/test1.php this is asuming you are offline